<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 头部警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
        show-icon   
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            clearable
            :options="cateList"
            :props="cateProps"
            v-model="selectedCateKeys"
            @change="handleChange">
          </el-cascader>
        </el-col>
      </el-row>
      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          
          <!-- 动态参数的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true">动态参数</el-button>
          <!-- 动态参数的表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 --><!-- 展开行 -->
          <el-table-column type="expand">
            <template slot-scope="scope">
              <!-- 循环渲染Tag标签 -->
              <el-tag
                closable
                v-for="(item, i) in scope.row.attr_vals"
                :key="i"
                @close="handleClose(i,scope.row)"
                >{{ item }}</el-tag
              >
              <!-- 输入的文本框 -->
              <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
              >
              </el-input>
              <!-- 添加按钮 -->
              <el-button
                v-else
                class="button-new-tag"
                size="small"
                @click="showInput(scope.row)"> + New Tag </el-button>
            </template>
          </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button size="mini" type="primary" icon="el-icon-edit"
                 @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete"
                   @click="removeParams(scope.row.attr_id)">删除</el-button
                  >
                </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 静态属性的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >静态属性</el-button
          >
          <!-- 静态属性的表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i,scope.row)"
                  >{{ item }}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button
                    size="mini"
                    type="primary"
                    icon="el-icon-edit"
                    @click="showEditDialog(scope.row.attr_id)"
                    >编辑</el-button
                  >
                  <el-button
                    size="mini"
                    type="danger"
                    icon="el-icon-delete"
                    @click="removeParams(scope.row.attr_id)"
                    >删除</el-button>
                </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加'+ titleText"
      :visible.sync="addDialogVisible"
      width="30%"
      @close="addDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef"
        label-width="100px" >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="30%"
      @close="editDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>


<script>
export default {
  data() {
    return {
      // 商品分类列表
      cateList: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定的数组
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 添加参数的表单数据对象
      addForm: {
        attr_name: "",
      },
      // 添加表单验证规制
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      // 添加对话框的显示与隐藏
      addDialogVisible: false,
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改参数的表单数据对象
      editForm: {
        attr_name: "",
      },
      // 修改表单验证规制
      editFormRules() {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ];
      },
      // 控制按钮与文本框的切换显示
      // inputVisible:false,
      // 文本框中输入的内容
      // inputValue:''
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败！")
      }
      this.$message.success("获取商品分类成功！")

      this.cateList = res.data;
      console.log(this.cateList);
    },
    //级联选择框变化，会触发这个函数
    handleChange() {
      this.getParamsData()
      // console.log(this.selectedCateKeys)
    },
    //tab 页签点击事件的事件
    handleTabClick() {    
      this.getParamsData()  
      console.log(this.activeName);
    },
    // 获取参数的列表
    async getParamsData() {
      //   证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }
      //证明选中的是三级分类
      console.log(this.selectedCateKeys);
      // 根据所选的分类Id，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败！");
      }
      

      res.data.forEach(item => {
        // 字符串变数组
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' '):[]
        // 控制文本框的显示与隐藏
        item.inputVisible = false;
        // 文本框中输入的值
        item.inputValue = "";
      })
      console.log(res.data);

      if (this.activeName === 'many') {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },

    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 点击按钮 添加参数
    addParams() {
      console.log('yesp')
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 201) {
          return this.$message.error("获取参数失败！");
        }
        this.$message.success("获取参数成功！");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    // 点击按钮 展示修改的对话框
    async showEditDialog(attr_id) {
      this.editDialogVisible = true;
      // 查询当前数据的Id
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName },
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数失败！");
      }
      this.editForm = res.data;
    },
    //
    editDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 点击按钮 修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("修改参数失败！");
        }
        this.$message.success("修改参数成功！");
        this.editDialogVisible = false;
        this.getParamsData();
      });
    },
    // 根据Id删除对应的参数项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      //  用户取消了删除操作
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除！");
      }
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      
      if (res.meta.status !== 200) {
        return this.$message.error("删除参数失败！");
      }
      this.$message.success("删除参数成功！");
      this.getParamsData();
    },
    // 文本框失去焦点，或按下Enter都会触发
    handleInputConfirm(row) {
      console.log('ok')
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }
      // 如果没有ruturn,则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      // 需要发起请求，保持这次操作
      this.saveAttrVals(row);
    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true;
      //让文本框自动获得焦点
      // $nextTick 页面上元素重新渲染之后，才会指定回调函数的代码
      this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    // 将对 attr_vals的操作，保持到数据库
    async saveAttrVals(row) {
      // 需要发起请求，保持这次操作
      const{data:res}=this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' '),
      });

      if (res.meta.status !== 200) {
        return this.error.$message.error("修改参数失败！");
      }
      this.error.$message.success("修改参数成功！");
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1);
    },
  },
  computed: {
    // 如果按钮需要被禁用，则返回true,否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      }
      return false;
    },
    // 当前选中的三级分类的Id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      }
      return null;
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    },
  },
};
</script>


<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>